Orlando Shooting: Investigation and Political Fallout

The deadliest mass shooting in U.S. history has sparked a debate on guns and terrorism. More

In the days after the shooting at an Orlando nightclub left 49 people dead and dozens wounded, the debate in Washington has turned to guns and terrorism. NBC's Pete Williams reports on the investigation and shooter. President Obama visited families of victims while after a 15-hour Democratic filibuster, senators will vote on four gun proposals next week.

AIR DATE 6/17/16